People in other professions do that all the time. Doctors go to serve in poor places so that they can have medical care, carpenters volunteer to help make furniture and structures for charity projects, and so on. It simply is not the case that programmers are the only professionals who will donate labor for the sake of the communal good.

However... those professions are encouraged to donate basic human needs/rights to those without resources. Yes, even tradespeople donate their time to those in need sometimes, but normally only to those in need.

Contrarily, open source can be easily observed to take resources in the form of created capital (ip) for less than full value or no value from the arguably more needy (individuals) and gives them to the not-needy-at-all (business).